Separate string by characters in python

Question

I'm trying to separate characters from any given strings and making subsring with it. For example,

str='abcd' => 'ab','bc','cd'

Here is my solution,

str='abcdef'
a=[]
for i in range(len(str)):
  a.append(str[i:i+2])
a.remove(a[-1])
print(a)

This works but I would like to know better way to do it.

Thanks

What is the logic? Do you want all the substrings of length 2? — Valentino
– Valentino, Commented Apr 27, 2019 at 16:40
Unrelated, but str is a builtin function. Do not use it as a variable. — Valentino
– Valentino, Commented Apr 27, 2019 at 16:43

sheldonzy · Accepted Answer · 2019-04-27 16:43:09Z

5

A possible solution without external modules (like your implementation, but cleaner).

[my_str[i:i+2] for i in range(len(my_str) - 1)]

so

In [3]: my_str='abcdef'

In [4]: [my_str[i:i+2] for i in range(len(my_str) - 1)]
Out[4]: ['ab', 'bc', 'cd', 'de', 'ef']

answered Apr 27, 2019 at 16:43

sheldonzy

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Austin · Accepted Answer · 2019-04-27 16:47:50Z

5

Use zip() (Built-in):

[f'{x}{y}' for x, y in zip(s, s[1:])]

Code:

s = 'abcdef'

print([f'{x}{y}' for x, y in zip(s, s[1:])]) # Python 3.6+. For previous versions, use below line.
# [x + y for x, y in zip(s, s[1:])] 

# Outputs: ['ab', 'bc', 'cd', 'de', 'ef']

edited Apr 27, 2019 at 16:47

answered Apr 27, 2019 at 16:44

Austin

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